Comparison between the genotoxicity of cis-Pt(ll) complex of 3-aminoflavone and cis-DDP in lymphocytes evaluated by the comet assay.

cis-bis(3-aminoflavone)dichloroplatinum(II) [cis-Pt(II) complex of 3-aminoflavone] is an analog of cis-DDP characterized by low cytotoxicity and anticancer properties in vivo. In order to evaluate genotoxic properties of this chemical compound, the comet assay in human lymphocytes was used. The analysis of DNA damage after 1-h cell incubation with cis-Pt(II) complex of 3-aminoflavone and cis-DDP was carried out, and DNA repair kinetics were evaluated after 0.5-h, 1-h, and 1.5-h postexposure incubation. It has been shown that cis-Pt(II) complex of 3-aminoflavone causes the increase in tail moments in comparison with cis-DDP. On the other hand, the decrease in these values caused by cis-DDP was connected mainly with the presence of DNA and DNA-protein crosslinks. The decrease in tail moments after cis-Pt(II) complex of 3-aminoflavone lymphocyte treatment was already observed after 0.5-h postexposure incubation, whereas in the variant with hydrogen peroxide application these values after cis-Pt(II) complex of 3-aminoflavone addition were higher in comparison with cis-DDP. Results obtained on the basis of the comet assay could confirm the occurrence of DNA breaks and cross-links induced by cis-Pt(II) complex of 3-aminoflavone.